Question 1

How is friction force calculated?

Accepted Answer

Friction force F = μN, where μ is the coefficient of friction and N is the normal force perpendicular to the surface.

Question 2

What is coefficient of friction?

Accepted Answer

A dimensionless ratio of friction force to normal force. Static μ (starting motion) is typically higher than kinetic μ (sliding).

Question 3

What's the difference between force and pressure?

Accepted Answer

Force (newtons) is a push or pull. Pressure (pascals) is force per unit area. Same force over smaller area = higher pressure.

Question 4

Why do we need different force units?

Accepted Answer

Newtons are SI standard. Pounds-force connects to everyday weight. Dynes (CGS) are used in some scientific fields. Each suits different applications.

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